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Title: Proteomic and Mutant Analysis of the CO2 Concentrating Mechanism of Hydrothermal Vent Chemolithoautotroph Thiomicrospira crunogena

Journal Article · · Journal of Bacteriology
DOI:https://doi.org/10.1128/JB.00871-16· OSTI ID:1407731
 [1];  [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [4];  [1]
  1. Univ. of South Florida, Tampa, FL (United States). Dept. of Integrative Biology
  2. Univ. of South Florida, Tampa, FL (United States). Dept. of Cell Biology, Microbiology, and Molecular Biology
  3. Richard Stockton College of New Jersey, Pomona, NJ (United States). Biology Program
  4. Univ. of Tennessee, Knoxville, TN (United States). Genome Science and Technology ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
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Many autotrophic microorganisms are likely to adapt to scarcity in dissolved inorganic carbon (DIC; CO2+ HCO3-+ CO32-) with CO2 concentrating mechanisms (CCM) that actively transport DIC across the cell membrane to facilitate carbon fixation. Surprisingly, DIC transport has been well studied among cyanobacteria and microalgae only. The deep-sea vent gammaproteobacterial chemolithoautotrophThiomicrospira crunogenahas a low-DIC inducible CCM, though the mechanism for uptake is unclear, as homologs to cyanobacterial transporters are absent. To identify the components of this CCM, proteomes ofT. crunogenacultivated under low- and high-DIC conditions were compared. Fourteen proteins, including those comprising carboxysomes, were at least 4-fold more abundant under low-DIC conditions. One of these proteins was encoded byTcr_0854; strains carrying mutated copies of this gene, as well as the adjacent Tcr_0853, required elevated DIC for growth. Strains carrying mutated copies of Tcr_0853 and Tcr_0854 overexpressed carboxysomes and had diminished ability to accumulate intracellular DIC. Based on reverse transcription (RT)-PCR, Tcr_0853 and Tcr_0854 were cotranscribed and upregulated under low-DIC conditions. The Tcr_0853 -encoded protein was predicted to have 13 transmembrane helices. Given the mutant phenotypes described above, Tcr_0853 and Tcr_0854 may encode a two-subunit DIC transporter that belongs to a previously undescribed transporter family, though it is widespread among autotrophs from multiple phyla.DIC uptake and fixation by autotrophs are the primary input of inorganic carbon into the biosphere. The mechanism for dissolved inorganic carbon uptake has been characterized only for cyanobacteria despite the importance of DIC uptake by autotrophic microorganisms from many phyla among theBacteriaandArchaea. In this work, proteins necessary for dissolved inorganic carbon utilization in the deep-sea vent chemolithoautotrophT. crunogenawere identified, and two of these may be able to form a novel transporter. Homologs of these proteins are present in 14 phyla inBacteriaand also in one phylum ofArchaea, theEuryarchaeota. Many organisms carrying these homologs are autotrophs, suggesting a role in facilitating dissolved inorganic carbon uptake and fixation well beyond the genusThiomicrospira.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
USF MCB4404L
Grant/Contract Number:
AC05-00OR22725; NSF-MCB-0643713; NSF-IOS-1257532
OSTI ID:
1407731
Journal Information:
Journal of Bacteriology, Vol. 199, Issue 7; ISSN 0021-9193
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (4)

MpsAB is important for Staphylococcus aureus virulence and growth at atmospheric CO2 levels journal August 2019
The microbiomes of deep-sea hydrothermal vents: distributed globally, shaped locally journal March 2019
DABs are inorganic carbon pumps found throughout prokaryotic phyla journal August 2019
Genomes of ubiquitous marine and hypersaline Hydrogenovibrio , Thiomicrorhabdus and Thiomicrospira spp. encode a diversity of mechanisms to sustain chemolithoautotrophy in heterogeneous environments : Hydrogenovibrio, Thiomicrorhabdus, Thiomicrospira journal April 2018

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
autotroph
bicarbonate transporter
carbon concentrating mechanism
carbon fixation
chemolithoautotroph
hydrothermal vent